@misc{indiciaeca16da6bdf0a,
  title = {Preliminary biostratigraphic map, Colyear Springs quadrangle, California},
  author = {D. L. Jones and E. H. Bailey},
  year = {1973},
  doi = {10.3133/mf517},
  url = {https://pubs.usgs.gov/publication/mf517},
  note = {Source identifier: mf517}
}